Improved boat-hoisting appaeatus



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A; F. GROSMAN, 0F STEAMER OSSIPEE, UNITED STATES NAVY. Lettera Patent No. 70,813, dated November 12, 1867.

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TO ALL WHOM I-T MAY CONCERN:

Beit known that I, A. F. CROSMAN, of Steamer Ossipee, North Pacific Squadron, United States Navy, have invented a new and improved Boat-HoistingfApparatus; and thatv the following description, taken in eennection with the accompanying drawings, hereinafter referred to, formso. full and exact specification of the same, wherein I have set forth the nature and principles of myjsaid improvements, by'which my invention may be distinguished from all others of a similar class, together with such parts as I claim, and desire to have secured to me by Letters Patent. j

This inventionl is designed to, facilitate the hoisting of 'sm'all boats at the sides offships and'other-vessels: The invention consists in a novel arrangement of the davit-tackles, as hereinafter fully shown'and described,

whereby the tackle of both davits are operated, and the boat hoistedor lowered by the manipulation of a single rope. The invention further consists in a novel means for releasing simultaneously both'ends of the boat from the hooks of the tackle-blocks, when the boat is lowered, so as to yreach the water, and thereby prevent the capsizingof the boat, a contingency of not unfreg'uent occurrence lwhen the water is rough.- In the accompanying sheet of drawings- Figure l is a side view of a portion of a ship or other .vessel provided withmy improvement.

Figure 2, a section of the same, taken in the line :v-x, iig.

Figure 3, a section of the same, taken in the line y y,.g. 1.

Similar letters f reference indicate like parts- A represents a portion Iof the side of avessel, and B B the davits attached thereto as usual, and provided with-the ordinary davitftockle C C. These parts being old and well known, do notrequire a special description. Each tackle C, however, instead of being operated separately, as is now the case,- has its .ropes aa attached to drums D D, which are secured on one andvthcsame shaft E, the bearings b of said shaft being secured tothe outer side of the vessel. The ropes a a are attached to the drums D D, so-that they will be wound around the same in opposite directions, and between the two 'drums D D there is an intermediate drum, F, around which a rope, Gr, passes. The shaft Eis midway between the two davi'ts B B, and it will bejseen that when the rope G is pulled, and the drums D D consequently turned, the two davit-tacklesl will be operated simultaneously, and

vthe boat H, which is attached to the hooks e of the lower tackle-blocks I,will be raised or lowered bythe manipulation of the rope G only.

y The boat H is suspended or attached to thehooks o of the lower. tackle-blocks as follows: To the bottom of the boat I-I, near each end of the same, there is attached a link, J, and a similar link, K, is fitted on the hookl c of the blocks I. On each link-K a hook, L, is fitted, the links passing through the hooks at their angles.

To the ends of the shanks of the hooks slotted bars ornarrow links M are pivoted, one to each. These bars or links serve as mousings, and retain or hold the links J on the hooks L, one end of the mousings being over the .ends ofthe hooks L, and the opposite ends retained 'by hooks N, which are suspended to thwarts in the boat, and have each a rope or chain, d, attached, which may pass overA pulleys or through guides e at the under sides of the thwarts, and are attached to va vertical`bar, f, which istted in ,a guide, g, at the centre of the'boat, and retained in position by a pin, It. When the b'oat is lowered so that it touches thewater, the pin h is withdrawn from the barf, and the inner ends of the vmousings M are thereby released, and the links J', under the weight or gravity of the boat and its load, instantly and simultaneously become detached from the hooks L.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- 1. The drums D Dupon the shaft E, secured to the side of the vessel between the davits, and provided with a rope, G, passing through the side ofv the vessel, all arranged as described, whereby the manipulations of they rope G operate the tackleropes a a simultaneously, as herein shown and described.

2. The arrangement of the links J K, hooks L, metallic mousings M, hooks N, and vertically sliding barf, for detaching the boat from'the tacklefblocks, as herein shown and described. A

The above specification of my invention signed by me this eleventh day of June, 1867, at Panama.

F. CROSMAN' Witnesses:

E. D. Ronin, Fnnnx. Hicks', 

